The invention discloses an electric brush alarm device of a slip ring brush carrier, which comprises a brush box, wherein a carbon brush is arranged in the brush box and can move vertically in the brush box, and an alarm switch is further connected onto the brush box. The electric brush alarm device of the slip ring brush carrier is characterized in that an insulated connection board is fixedly arranged on the brush box, a support frame is arranged on the insulated connection board, a rotating shaft is hinged in the support frame, a torsion spring is arranged on the rotating shaft, and a switch contact arm is further arranged on the rotating shaft. One end of the switch contact arm is contacted with the bottom surface of an electric brush contact head arranged at the upper end of the carbon brush, the other end of the switch contact arm is provided with a switch contact point which is matched with the alarm switch fixedly connected onto the insulated connection board. The electric brush alarm device is simple in structure, ingenious in design and capable of preventing the alarm switch from being punctured or burnt down during operation of a motor.